接触器还可方便地加装辅助触头组，和适当的热继电器组合，保护可能发生过负载的电路之用。
Contactor can be easily retro-fitting auxiliary contact group, and appropriate combination of thermal relay to protect the load that may have been circuits.
本文介绍组合继电器的构成原理。
The paper introduce the structure principle of the combination relay.
以往来说，典型电路保护将继电器、可恢复式保险丝、与金属氧化物压敏电阻组合来保护防止损害。
Previously, a typical protection circuit would include a relay, resettable fuse and MOV combination to protect against the above combination of threats.
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